HID backend

device/hid/hid_connection_win.h

+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DEVICE_HID_HID_CONNECTION_WIN_H_
+#define DEVICE_HID_HID_CONNECTION_WIN_H_
+
+#include <set>
+#include <windows.h>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
+#include "base/threading/thread_checker.h"
+#include "base/win/object_watcher.h"
+#include "device/hid/hid_connection.h"
+#include "device/hid/hid_device_info.h"
+#include "net/base/io_buffer.h"
+
+namespace device {
+
+class HidConnectionWin : public HidConnection {
+ public:
+  struct PendingTransfer : public base::RefCounted<PendingTransfer>,
+                           public base::win::ObjectWatcher::Delegate,
+                           public base::MessageLoop::DestructionObserver {
+   public:
+    PendingTransfer(scoped_refptr<HidConnectionWin> conn,
+                    scoped_refptr<net::IOBuffer> target,
+                    scoped_refptr<net::IOBuffer> receiving,
+                    bool is_input,
+                    IOCallback callback);
+
+    void TakeResultFromWindowsAPI(BOOL result);
+
+    OVERLAPPED* GetOverlapped() { return &overlapped_; }
+
+    // Implements base::win::ObjectWatcher::Delegate.
+    virtual void OnObjectSignaled(HANDLE object) OVERRIDE;
+
+    // Implements base::MessageLoop::DestructionObserver
+    virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
+
+
+   private:
+    friend class base::RefCounted<PendingTransfer>;
+    friend class HidConnectionWin;
+
+    virtual ~PendingTransfer();
+
+    scoped_refptr<HidConnectionWin> conn_;
+    bool is_input_;
+    scoped_refptr<net::IOBuffer> target_;
+    scoped_refptr<net::IOBuffer> receiving_;
+    IOCallback callback_;
+    OVERLAPPED overlapped_;
+    base::win::ScopedHandle event_;
+    base::win::ObjectWatcher watcher_;
+
+    DISALLOW_COPY_AND_ASSIGN(PendingTransfer);
+  };
+
+  HidConnectionWin(HidDeviceInfo device_info);
+
+  virtual void Read(scoped_refptr<net::IOBuffer> buffer,
+                    size_t size,
+                    const IOCallback& callback) OVERRIDE;
+  virtual void Write(scoped_refptr<net::IOBuffer> buffer,
+                     size_t size,
+                     const IOCallback& callback) OVERRIDE;
+  virtual void GetFeatureReport(scoped_refptr<net::IOBuffer> buffer,
+                                size_t size,
+                                const IOCallback& callback) OVERRIDE;
+  virtual void SendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
+                                 size_t size,
+                                 const IOCallback& callback) OVERRIDE;
+
+  void OnTransferFinished(scoped_refptr<PendingTransfer> transfer);
+  void OnTransferCanceled(scoped_refptr<PendingTransfer> transfer);
+
+  bool available() const { return available_; }
+
+ private:
+  ~HidConnectionWin();
+
+  base::win::ScopedHandle file_;
+  std::set<scoped_refptr<PendingTransfer> > transfers_;
+
+  DISALLOW_COPY_AND_ASSIGN(HidConnectionWin);
+
+  bool available_;
+};
+
+}  // namespace device
+
+#endif  // DEVICE_HID_HID_CONNECTION_WIN_H_